... requirements for high hotels, restaurants and public facilities, indoor ceiling, walls and wall stickers. 3 features: In addition to ... 2440 × 1220 × 15 2440 × 1220 × 15 Burning building decoration materials should be divided into four performance levels: A-level, non ... flame; B2 level, flammability; B3 level, flammability Selection of materials to choose B1 level and above. pvc gypsum ceiling board